Nb-iot single-phase intelligent meter; with prepaid function, remote reading function, prepaid function, all-in-one card function, anti stealing function, anti-high-voltage attack and static attack, good anti harmonic function, pulse alarm display power stealing function, etc.; single-phase nb-iot Internet of things meter has ultra-low power consumption, ultra long standby, strong standby signal Swipe card wake up more sensitive, more waterproof, more convenient.